Portion of a shoe sole



FIG. 1 is a rear perspective view of a portion of a shoe sole showing a new design;

FIG. 2 is a front perspective view of the portion of a shoe sole of FIG. 1;

FIG. 3 is a side elevational view of the portion of a shoe sole of FIG. 1; and,

FIG. 4 is a rear elevational view of the portion of a shoe sole of FIG. 1.

Please note that the Figures include broken, solid and dash-dot-dash lines. The area within the solid and dash-dot-dash lines forms the claimed design. The area within the broken lines is environmental. Color contrast and texture form no part of the claimed design in any of the Figures. 

The ornamental design for a portion of a shoe sole, as shown and described. 